Can someone please explain how to use K2 Comments? I have 'Comment Link' set to show in the module settings, but I don't see a link to post comments. The module is in a members-only area of my website, where I'm using an i-frame to display a PDF file, which is a book synopsis. I want users to be able to comment on it and see other people's comments.

What do I need to do?

K2 Comments only work in items.
Publish the pdf in a K2 item if you want users to be able to comment on it.

Hello there,
I also have a problem using K2 comments. It appears below the article, it's all set up in parameters, but when I want to test it, it says that the name and e-mail are already in use. Which use?
Can you help me how to fix it?
Thank you in advance.

@Natasha

You get this message because you are trying to use the name and the email of a registered user but you have not logged in. You have to either log in first or use a name and an email that is not used by a registered user.

Thank you Lefteris, I tried it with another e-mail and it helped!:)
Since you're here, let me ask you another thing. I wanted to adjust my responsive logo in css/custom.css and I've messed something up because my site is loading like 60 seconds. I passed threw all modifications I've done and it's still slow as hell. Do you have any idea what could have gone wrong?
Thanks a lot.

@Natasha

Is there a link to your site?

Yes. www.dubrovnikemportugues.com
Thanks

Unfortunately i cannot tell why your page is so slow. Probably an extension is causing all this. I don't think that changes to CSS files are causing the issue. It might be also a server issue.

Thank you for verifying it. Do you suggest a back up?

If this is not a server issue, you can start disabling some modules and plugins, one by one until you find which one is causing the issue.

Finally make sure that you have enabled Joomla! caching .